sensors Mode-S transponder
840DF8
ICAO 24-bit transponder address · allocated to Japan
Currently assigned to JA03WJ · AIRBUS A-350-1000
- Hex
- 840DF8
- Octal
- 41006770
- Decimal
- 8,654,328
- Country
- JP
- Tail
- JA03WJ
- Type
- A35K
- Flights observed
- 75
- Distinct callsigns
- 12
- Country
- JP
- Last broadcast
- 5h ago
Current position
Country allocation
The ICAO 24-bit address 840DF8 falls within the block assigned to Japan (JP) by ICAO Annex 10, Volume III. Every aircraft registered in Japan receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.
Callsign history 12 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| JAL44 | Japan Airlines | 10 | 2026-05-08 |
| JAL3 | Japan Airlines | 10 | 2026-05-22 |
| JAL43 | Japan Airlines | 8 | 2026-05-08 |
| JAL4 | Japan Airlines | 8 | 2026-05-21 |
| JAL12 | Japan Airlines | 7 | 2026-05-26 |
| JAL11 | Japan Airlines | 6 | 2026-05-26 |
| JAL6 | Japan Airlines | 5 | 2026-05-20 |
| JAL5 | Japan Airlines | 5 | 2026-05-20 |
| JAL16 | Japan Airlines | 5 | 2026-05-27 |
| JAL15 | Japan Airlines | 5 | 2026-05-27 |
| JAL46 | Japan Airlines | 3 | 2026-05-29 |
| JAL45 | Japan Airlines | 3 | 2026-05-29 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | JAL46 | CDG → HND | May 29, 20:15 UTC | May 30, 00:15 UTC | 4h 0m |
| 2026-05-29 | JAL45 | HND → CDG | May 29, 03:10 UTC | May 29, 16:55 UTC | 13h 45m |
| 2026-05-27 | JAL15 | LAX → HND | May 27, 21:40 UTC | May 28, 08:45 UTC | 11h 5m |
| 2026-05-27 | JAL16 | HND → LAX | May 27, 09:30 UTC | May 27, 18:55 UTC | 9h 25m |
| 2026-05-26 | JAL11 | DFW → HND | May 26, 17:20 UTC | May 27, 05:45 UTC | 12h 25m |
| 2026-05-26 | JAL12 | HND → DFW | May 26, 02:15 UTC | May 26, 13:40 UTC | 11h 25m |
| 2026-05-24 | JAL15 | LAX → HND | May 24, 21:15 UTC | May 25, 08:10 UTC | 10h 55m |
| 2026-05-24 | JAL16 | HND → LAX | May 24, 09:05 UTC | May 24, 18:25 UTC | 9h 20m |
| 2026-05-23 | JAL11 | DFW → HND | May 23, 17:40 UTC | May 24, 06:10 UTC | 12h 31m |
| 2026-05-23 | JAL12 | HND → DFW | May 23, 02:10 UTC | May 23, 12:55 UTC | 10h 44m |
| 2026-05-22 | JAL3 | JFK → HND | May 22, 05:50 UTC | May 22, 18:55 UTC | 13h 5m |
| 2026-05-21 | JAL4 | HND → JFK | May 21, 10:50 UTC | May 21, 22:40 UTC | 11h 50m |
| 2026-05-20 | JAL5 | JFK → HND | May 20, 18:10 UTC | May 21, 07:35 UTC | 13h 25m |
| 2026-05-20 | JAL6 | HND → JFK | May 20, 02:40 UTC | May 20, 14:25 UTC | 11h 46m |
| 2026-05-15 | JAL5 | JFK → HND | May 15, 18:10 UTC | May 16, 07:25 UTC | 13h 16m |
| 2026-05-15 | JAL6 | HND → JFK | May 15, 02:55 UTC | May 15, 15:15 UTC | 12h 19m |
| 2026-05-13 | JAL46 | CDG → HND | May 13, 19:05 UTC | May 14, 08:05 UTC | 13h 0m |
| 2026-05-13 | JAL45 | HND → CDG | May 13, 01:50 UTC | May 13, 15:40 UTC | 13h 50m |
| 2026-05-12 | JAL3 | JFK → HND | May 12, 05:45 UTC | May 12, 19:20 UTC | 13h 35m |
| 2026-05-11 | JAL4 | HND → JFK | May 11, 10:55 UTC | May 11, 22:35 UTC | 11h 40m |
| 2026-05-10 | JAL5 | JFK → HND | May 10, 17:59 UTC | May 11, 06:55 UTC | 12h 55m |
| 2026-05-10 | JAL6 | HND → JFK | May 10, 02:30 UTC | May 10, 14:30 UTC | 12h 0m |
| 2026-05-08 | JAL44 | LHR → HND | May 8, 19:05 UTC | May 9, 08:10 UTC | 13h 5m |
| 2026-05-08 | JAL43 | HND → LHR | May 8, 01:09 UTC | May 8, 14:25 UTC | 13h 15m |
| 2026-05-06 | JAL44 | LHR → HND | May 6, 19:05 UTC | May 7, 08:15 UTC | 13h 10m |
| 2026-05-06 | JAL43 | HND → LHR | May 6, 01:15 UTC | May 6, 14:30 UTC | 13h 15m |
| 2026-05-05 | JAL3 | JFK → HND | May 5, 05:50 UTC | May 5, 19:15 UTC | 13h 25m |
| 2026-05-04 | JAL4 | HND → JFK | May 4, 11:10 UTC | May 4, 23:35 UTC | 12h 26m |
| 2026-05-03 | JAL46 | CDG → HND | May 3, 18:40 UTC | May 4, 08:05 UTC | 13h 25m |
| 2026-05-03 | JAL45 | HND → CDG | May 3, 01:55 UTC | May 3, 15:40 UTC | 13h 44m |
| 2026-05-01 | JAL5 | JFK → HND | May 1, 17:55 UTC | May 2, 08:00 UTC | 14h 5m |
| 2026-05-01 | JAL6 | HND → JFK | May 1, 02:55 UTC | May 1, 15:15 UTC | 12h 20m |
| 2026-04-29 | JAL15 | LAX → HND | Apr 29, 21:05 UTC | Apr 30, 08:15 UTC | 11h 9m |
| 2026-04-29 | JAL16 | HND → LAX | Apr 29, 09:15 UTC | Apr 29, 18:10 UTC | 8h 55m |
| 2026-04-28 | JAL11 | DFW → HND | Apr 28, 17:15 UTC | Apr 29, 06:15 UTC | 13h 0m |
| 2026-04-28 | JAL12 | HND → DFW | Apr 28, 02:15 UTC | Apr 28, 13:05 UTC | 10h 50m |
| 2026-04-26 | JAL44 | LHR → HND | Apr 26, 18:55 UTC | Apr 27, 07:50 UTC | 12h 55m |
| 2026-04-26 | JAL43 | HND → LHR | Apr 26, 01:10 UTC | Apr 26, 14:35 UTC | 13h 25m |
| 2026-04-25 | JAL3 | JFK → HND | Apr 25, 06:05 UTC | Apr 25, 19:25 UTC | 13h 20m |
| 2026-04-24 | JAL4 | HND → JFK | Apr 24, 11:10 UTC | Apr 24, 23:15 UTC | 12h 5m |
| 2026-04-23 | JAL44 | LHR → HND | Apr 23, 18:45 UTC | Apr 24, 07:45 UTC | 13h 0m |
| 2026-04-23 | JAL43 | HND → LHR | Apr 23, 02:00 UTC | Apr 23, 15:15 UTC | 13h 15m |
| 2026-04-21 | JAL5 | JFK → HND | Apr 21, 18:25 UTC | Apr 22, 08:01 UTC | 13h 35m |
| 2026-04-21 | JAL6 | HND → JFK | Apr 21, 04:05 UTC | Apr 21, 15:55 UTC | 11h 50m |
| 2026-04-19 | JAL44 | LHR → HND | Apr 19, 18:50 UTC | Apr 20, 07:55 UTC | 13h 5m |
| 2026-04-19 | JAL43 | HND → LHR | Apr 19, 01:25 UTC | Apr 19, 15:00 UTC | 13h 35m |
| 2026-04-18 | JAL44 | LHR → HND | Apr 18, 07:25 UTC | Apr 18, 08:00 UTC | 35m |
| 2026-04-18 | JAL44 | LHR → HND | Apr 18, 06:10 UTC | Apr 18, 07:20 UTC | 1h 10m |
| 2026-04-17 | JAL44 | LHR → HND | Apr 17, 21:25 UTC | Apr 17, 23:15 UTC | 1h 50m |
| 2026-04-17 | JAL44 | LHR → HND | Apr 17, 19:25 UTC | Apr 17, 21:20 UTC | 1h 55m |
About Mode-S
A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.
Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.
Prefer a tail-number view? See the JA03WJ page for operator, model, and routing details .